Originally Posted by
26volt
From what's on their page, it mentions its from 4:30am to 8pm, though someone posted in their Facebook page if they're going to keep the lounge open later than 8p for CI passengers, and they said they're going to keep it open for them.
You don't need to be AMEX member and going on CI flight to enter the lounge.
Ontario Escape Lounge Escape Lounges Escape Lounges
I have Amex Plat, so it looks like I can get in for free even without flying CI - and it's in T2 where UA flies, so now I have a very nice looking lounge option when flying from ONT - good news!